Conversion From String" And Textbox Arithmetic?

Sep 26, 2011

I'm stumped with something I thought I had been doing fine for months now. I get the error, "conversion from string '''' to type 'Double' is not valid."I've also tried to Dim the variables within the private subs with different names and whatnot. I've commented out the TextBox10 and have decided that the error has something to do with me reassigning the textbox value to a variable.

[Code]...

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String To Arithmetic Operator Conversion

Mar 18, 2009

I am building an equation parser, it takes the equation
"( 3456 + 321 * X ) / 45"

For example. As I couldn't find a direct solution to parse this equation, I split the equation and started implementing the operations 1 by 1 until I stuck with the execution order of the arithmetic operators (as the multiplication should be performed before the addition). So I am trying now to avoid this and try to parse the full equation. Is there a way to convert the string "+" to + for example?

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Converting Arithmetic Expression With Operators In A String To An Operable Arithmetic Expression

Feb 5, 2010

I must convert string data from a CNC that is arithmetic expression to a number that I can use in a VB application that I wrote. The following is what I get out of the cnc. [18722*65536+19377]/67108864. I need to evaluate this expression in my VB ap. The format of the string is not always the same as what I have illustrated.

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VS 2010 String Conversion - EValue Of Type 'String' Cannot Be Converted To 'System.Windows.Forms.TextBox'

Apr 8, 2011

I'm trying to code a program but this error repeatedly shows up and I can't for the life of me figure it out EValue of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'. It appears in relation to this code

[Code]...

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Manipulation Textbox To Produce An Arithmetic Result?

Jun 17, 2010

Lets say i have three buttons[cod]e...

how do i write my code under button3 that my result will output 27 on the textbox

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Achieve CSS With Constant Values , Arithmetic And String Manipulation?

Mar 30, 2012

When developing ASP.NET websites (using VB.NET web forms) - a lot of my time is spend writing CSS files and they always seem to get messy (code duplication) and very long.

All I want to achieve is to be able to manipulate the CSS using VB.NET code in the following ways:

Use an integer variable to store my "golden" number 7 and use that for width, padding, margin etc where needed
Use string variables to store my "golden" hex color codes e.g. "#44C5F2" and use them for color, background-color, border-color etc. where needed Use an integer variable to set the height of an element and have four child elements each with height: mynum / 4

I just want to use basic VB.net number and string manipulation in order to create a CSS file on the fly.

I understand that the end product - the CSS file shouldn't change much - it should at most change on a daily basis otherwise caching couldn't be used.[code]...

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Conversion Error On Line 5 Stating 'Conversion From String 'S' To Type 'Double' Is Not Valid

Apr 8, 2009

a user will enter a number, n, which ranges from 1 to 30. they will also enter a "P" or an "S" (sum or product). depending on which was selected, it will calculate the sum or product of the numbers from 1 to n.i'm having a conversion error on line 5 stating "Conversion from string "S" to type 'Double' is not valid." [code]

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Show Textbox Input In MsgBox Error! Conversion From String "Tabii" To Type 'Integer' Is Not Valid?

Feb 19, 2012

The project I'm working on is a Multichoice RadioButton quiz with answers and percentintegers. At the end there is a MsgBox that gives the number of answers counted 'correct'and the percent 'correct'. Also after you press the confirm button on that MsgBox it emails the results to the built in information given on the SMTP information. What I am trying to do now is show the input typed into the textbox on FormA in the MsgBox at the very end.

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.net - String Query Error Conversion From String "iif(CurCons = 0, " To Type 'Double' Is Not Valid

Jul 4, 2011

I make a query in coding. But I got conversion error.My query is below

Dim strSelect As String = ""
strSelect = "SELECT " & _
"Description As [Desc], " & _

[code].....

Exception error is like

Conversion from string "iif(CurCons = 0, " to type 'Double' is not valid

Actually, in my report, i wanna show if it's zero then '-'. If i set it in this string.I got another error like below The provider could not determine the Decimal value. For example, the row was just created, the default for the Decimal column was not available, and the consumer had not yet set a new Decimal value.

From da.Fill
Dim cmd As New OleDbCommand(strDynamic, m_DBConn)
Dim da As New OleDbDataAdapter(cmd)
da.Fill(ds, "tblCur")

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Conversion From Label To Textbox?

Jun 5, 2011

How can i convert the Label to TextBox in VB.Net at runtime...

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Type Conversion From Textbox.text?

Oct 19, 2010

Sub Calculate_G97_RPM()
Dim tmpRPM As Single = 0, MaxRPM As Single = 0
If Me.RB_English.Checked Then

[Code].....

I cannot get a value from Me.TB_SFM.Text. Upon running it is always "". It's default value is 150 and 150 shows up on the form. I get a conversion problem. I have deleted the text box, recreated and used a different name, all to no avail.

Also, If anyone has a link to a good resource on dealing with textbox data. We do alot of text boxes and are constantly converting data types. Would like to know the correct way to do it.

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Decimal To Binary Conversion And Display In Textbox?

Mar 7, 2010

I want to take more than one number separated by one space from txtDec textbox and display their binary form again separated by one space in txtBin textbox.

My code below ---
Private Sub DecToBin()
Dim i As Integer = txtDec.Text
Dim binary As String = Convert.ToString(i, 2).PadLeft(8, "0"c)
txtBin.Text = binary
End Sub

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.net - C#: UniCode To String Conversion?

Nov 15, 2010

How can I Convert a Unicode value to its equivalent string for example i have "రమెశ్" and i need a function that accepts this unicode value and returns a string I was looking at the System.Text.Encoding.Convert() function but that does not take in a Unicode value, it takes 2 encodings and a byte array. I bascially have a byte array that I need to save in a string field and then come back later and convert the string first back to a byte array. So i use ByteConverter.GetString(byteArray) to save the byte array to a string but can't get it back to a byte array.

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C# - String Escape Conversion .net?

Nov 28, 2011

I need to convert this string to the proper form in my vb,net code

if (c == '"') {
s.Append('"');
} else if (c == '\') {
s.Append('\');
} else if (c == '/') {

[Code]...

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Conversion From GPS-string To Double?

Oct 20, 2011

I'm reading Lat + Lng coordinates form my database. I need to convert them to double. This is what happens:

Dim strLat As Double = CDbl(reader.Item("lat").ToString) MsgBox(strLat.ToString) ' << result: 5237861 should be: 52.37861. The point is removed.

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Conversion From String Not Valid

Mar 4, 2010

i have a program that you enter a code and your selection goes ito a richtextbox and is then added up in another as you select more items, i have run into a problem it worked a few days ago but now will not.

Dim dectotal As Decimal
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code]....

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Conversion From String To Integer?

Nov 8, 2009

I get an InvalidCastException was unhandled on converting the .value to .text but I can't figure out how to convert it. Tried a few different ways but nothing seems to work. load a file from disk and have that be assigned to the trackbar.value?

Dim FileName = (App_Path() & "SettingsPingTimeout.txt")
If File.Exists(FileName) Then
lblPingTimeout.Text = "Ping Timeout: " &

[Code]....

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Conversion Of A String To Double?

Jul 30, 2011

I want to convert the string value "13.3939" into a Double yet when I tried Convert.ToDouble("13.3939"), Double.Parse("13.3939") and CDbl("13.3939") they all returned 133939.0. Does anyone know how to do this properly?

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Conversion Of A String To Possibly Hex Or Something Else

Dec 27, 2010

I am trying to rewrite a php function to vb.net and can't find out what the heck this does... I thought it did HEX, but I am getting a different value.[code]so basically I need something that takes each character and finds whatever "0x0" is doing.

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Conversion Of DBNULL To String?

Apr 17, 2009

Is it possible to converty a type System.DBNULL to a string type?

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DateTime Conversion From String?

Jun 18, 2012

I am getting this datetime format in an xml file:

2012-06-14T11:15:41.587-07:00
2012-06-14T10:49:32.397-07:00
2012-06-11T11:10:49.2-07:00

I believe I understand some of it, please correct me if I am wrong:

2012-06-14 = date

T = time identifier

10:49:32.397 = hour min second milliseconds

-07:00 = I have no idea

I need to convert this to something I can sort on for my datagrid view.

When I try something like this:

Console.WriteLine(String.Format("{0:d/M/yyyy HH:mm:ss}", "2012-06-14T10:49:32.397-07:00"))

I'm getting the original string back out with no conversion.

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DateTime To String Bad Conversion?

Nov 22, 2010

I'm pulling a saved DateTime using

Dim testDate As DateTime
testDate = rsQuery.Fields("ScenarioDate").Value

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Hexadecimal To String Conversion?

Mar 1, 2010

I am currently working on a software that will convert a string to it's hexadecimal equivalent and back. I have created the following code to make the convert the string to hexadecimal, but I cannot figure out how to get it back.

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim skill As String
skill = RichTextBox1.Text
Dim skillfullbyte() As Byte

[code]....

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String To Date Conversion

Dec 3, 2008

I have a date that is in string format and I want to put it in a datetime field. I tried

[Code]...

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String To Integer Conversion?

Apr 25, 2011

I am trying to write a function which accepts a string as input and gives the integer as output,The string can be in any of these format for ex:2,500.75 or 2.500,7501 or 2'500.7513 or 2500,254 the output of function should be like 2500.56 Basically trying to get rid of the thousand separator which can be either a comma,or apostrophe. ..

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String To Number Conversion?

Nov 27, 2010

I have a string such as

Dim my_sum As string = "100*10-5"

but when i do this:

msgbox(mysum)

it will output "100*10-5"

but i want it too output it so it works the sum out which should be 995

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String To Unicode Conversion

Nov 12, 2009

How could i convert a Greek string, to Unicode with VB.NET, without knowing the source encoding?

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VB To .net Conversion Buffer String?

Sep 3, 2011

I've looked and looked + tryed debugging but I'm not getting anywhere fast I'm trying to import a usb radio driver and I'm 99% there. I can turn it on / off and get / set the freq.. but I'm struggling to get the rds name from it. The VB code for the function is

[Code]...

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Colordialog Conversion To Number Rather Than String?

Aug 7, 2009

colordialog1.color will yield "Color [A=255, R=95, G=33, B=222]", but i would like to return an integer like 2349821 instead. how is this possible?

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Compiler Conversion From String To Number

Apr 18, 2011

This is more of a curiosity question on what the VB compiler is doing. Basically the following code generates an error,
If "String" = CInt(1) Then
End If
As it should. What makes me curious is the error reported is
Conversion from string "String" to type 'Double' is not valid.
So, I guess my question is, why is the compiler attempting to convert to a Double when I would assume it should be converting to Integer?

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